Abstract
D. F. BALL has raised a number of points arising out of our original communication on this subject. The distinction between the definition of soil horizons adopted by the U.S. Department of Agriculture1 and that by Kubiena2 turns on the question of the nomenclature of the solid rock. In the first system this would be designated as a D horizon and, in the other, either as a C 2 or a D horizon depending on its relationship to the regolith. Whichever system is adopted, and each has its merits, the essential requirement remains that a C horizon should bear a direct relationship to the solum developed. In a recent text it is noteworthy that Thompson3 states that: “The recent trend is to describe the consolidated parent material below the C horizon (or immediately beneath the B horizon) as the D r horizon”.
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References
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WILLIMOTT, S., GILCHRIST SHIRLAW, D. C Horizon of the Soil Profile. Nature 189, 689–690 (1961). https://doi.org/10.1038/189689a0
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DOI: https://doi.org/10.1038/189689a0
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